Emergence of a real-space symmetry axis in the magnetoresistance of the one-dimensional conductor Li_0.9Mo₆O₁₇.

ABSTRACT: We report on an emerging symmetry axis in the magnetoresistance of bulk single crystals of quasi-one-dimensional Li_0.9Mo₆O₁₇ below T _min = 25 K, the temperature at which the electrical resistivity experiences a minimum. Detailed angle-dependent magnetoresistance sweeps reveal that this symmetry axis is induced by the development of a negative magnetoresistance, which is suppressed only for magnetic fields oriented along the poles of the MoO₆ octahedra that form the conducting chains. We show that this unusual negative magnetoresistance is consistent with the melting of dark excitons, composed of previously omitted orbitals within the t _2g manifold that order below T _min. The unveiled symmetry

SUBMITTER: Lu J 

PROVIDER: S-EPMC6611691 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature